Which situation is an example of nonnative species introduction?

1.a huge volcanic eruption in washington destroyed many habitats.

2.a large oil spill in the gulf of mexico killed many organisms that lived there.

3.horseshoe crabs in the waters of virginia have been overfished, and their numbers have declined.

4.water hyacinths from asia now grow in the united states and are crowding out animals and other plants.

4. Water hyacinths from Asia now grow in the United States and are crowding out animals and other plants.

Nonnative species can sometimes be introduced in an area that is not their natural habitat. This can cause disruptions in the ecosystem. In this case, the water hyacinths from Asia were introduced to the United States. Now, they have caused disruptions in the ecosystem, resulting in the crowding out of animals and other plants.

not  

cuba  

russia  

iraq  

el salvador  

explanation:

known as the land of volcanoes, el salvador has visit seismic tremors and volcanic movement. it is the main nation in central america that does not have a coastline on the caribbean sea. about portion of all salvadorans live in the wide open. they are poor and don't have power or running water in their homes. in 1525, pedro de alvarado, a lieutenant of cortés's, vanquished el salvador. el salvador, with alternate nations of central america, pronounced its freedom from spain on sept. 15, 1821, and was a piece of a league of central american states until the point when that association broke up in 1838.